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The effect of rifampicin and isoniazid on liver and lung tissues in rats
Dalal F. AhmedDepartment of Biology/University of Mosul, Iraq
Received Accepted
.
.201
. .201
ABSTRACT
Objectives: The purpose of this study was to investigate the histopathological
changes in Swiss albino rats liver and lung tissues resulted from the oral
administration of the antituberculous drugs rifampicin and isoniazid.
Materials and Methods: The study was conducted on 24 adult rats aged 2.5-3
months weighing 200-250 g randomly distributed into four groups(6 animals for
each), the first group served as a control group while the remaining three as test
groups. The rifampicin group was treated with 50 mg/kg B.W. once per day for 60
days, the isoniazid group was treated with 25 mg/kg B.W. once per day for 60 days,
the rifampicin and isoniazid groups were treated with 50, 25 mg/kg B.W. respectively
once per day for 60 days.
Results: Giving rifampicin alone orally once daily for 60 days caused fattydegenerative and necrotic changes in the liver in addition to proliferative lesions and
emphysema in the lung. Rats receiving isoniazid alone orally once daily for 60 days
showed similar degenerative and necrotic changes in liver and lung but of lower
intensity. Whereas those receiving rifampicin and isoniazid combination for 60 days
showed pathological changes similar to those induced when each of the two types of
antituberculosis drugs was given alone but of more intensity.
Conclusion:Rifampicin and isoniazid showed clear histopathological changes in the
rat's liver and lung tissues when given separately ; however, changes where more
intense when givenin combination.
Keywords: Rifampicin, isoniazid, hepatotoxicity, emphysema.
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Tuberculosis is one of the mostwidespread diseases and causes of
death in the world.Tuberculosis is
caused by Mycobacterium
tuberculosis, which is relatively
resistant to many antibiotics. As such,recovery from this disease may be
long1, 2
.
Anti-tuberculosis agents
containing two different compounds
were used for the treatment of this
disease, as well as long-term treatment
in order to prevent the infection from
occurring again3,4. The anti-
tuberculosis agents were found to have
serious adverse effects such as
hepatotoxicity, hepatitis and lung
inflammation. Moreover, the damagescaused by the intensity of the drug vary
from simple diseases to more complex
ones, such as liver failure. Two
compounds, rifampicin and isoniazid,
as well as ethanobutane and
streptomycin- were used to cure the
disease5, 6
.
Rifampicin is one of the semi-
artificial antibiotics which are derived
from the Streptomycin group, and is
used against Staphyllococcus,
Mycobacterium and Brucella7.Rifampicin was found to lower the
growth of most positive and negative
bacteria to Gram pigment. Highest
concentration of rifampicin in plasma
is reached after 2 hours from oral
treatment, and is distributed in
significant concentrations throughout
body fluids8. Administrating
rifampicin yields various side effects
including the appearance of red and
orange colors in urine and saliva in
addition to various secretions of the
respiratory system, skin rash, vomiting
and nausea, and when used with other
compounds; liver and renal failure9.
Isoniazid, is used for the
treatment of tuberculosis because it
spreads throughout body fluids and
cells when administered orally or by
injection. Isoniazid acts as a prodrug
which changes into its active form that
inhibits the function of the enzyme
responsible for the formation of the
cell wall of the bacteria causing
tuberculosis. However, studies found
that isoniazid causes many side effectsincluding, skin rash, fever, jaundice,
back pain, infection and atrophy of
optic nerve, and negative impact on the
peripheral nerves and the central
nervous system10
.
Damage to the liver in various
degrees could be the cause of
administrating both rifampicin and
isoniazid11,12
, but the question here is;
do length of treatment period has an
impact on liver and other body organs
such as the lungs? The current studywas designed to answer this question.
Materials and Methods
The study was conducted at the
animalhouse in the College of
Veterinary Medicine, University of
Mosul from February-June 2010.
Twenty-four adult Albino rats, aged
2.5-3 months and weighed 200-250 g
were bred in a room with conditions
suitable for this experiment.
Experiment Plan
Twenty-four adult rats were randomly
and equally distributed into four
groups. These groups were treated
using Gavage needle for 60 days, as
follows:
1- Control group: treated with 0.5 mL
of distilled water.
2- Rifampicin group: treated with 50
mg/kg B.W. of rifampicin once per
day.
3- Isoniazid group: treated with 25mg/kg B.W. of isoniazid once per day.
4- Rifampicin and isoniazid group:
treated with 50 mg/kg B.W., 25 mg/kg
B.W.once per day, respectively.
At the end of the treatment stage, the
rats were dissected to extract the livers
and lungs after sedating the animals
with ether. An abdominal incision was
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Tissue changes resulting from
rifampicin treatment on liver
Lab tests showed hepatic coagulative
necrosis, congestion of the blood
vessels (Figure 2) , the central vein
(Figure 3), hepatic sinusoids (Figure 4)
and interlobular septums (Figure5).
Figure 3: Congestion of central vein(A),numerous sites locations ofcoagulative
necrosis (B, C, D), fatty degenerative (E)in the rifampicin treated rat (1000X)
Figure 2: Coagulative necrosis of hepaticcells (A) and congestion of the blood
vessel (B) and fatty degenerative (C) inthe rifampicin treated rat (1000X)
Figure 5: Congestion of liver sinusoid (A)
and the interlobular septums(B) (400X) inthe rifampicin treated rat
Figure 4: Congestion of central vein(A),
liver sinusoids(B) and liver necrosis (C)in the rifampicin treated rat (400X)
A B
C A
B
C
D
E
A
B
C
A
B
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Figure 6: Congestion of central vein (A) and the overall change in liver tissue (B, C)
In the isoniazide treated rat
Tissue changes resulting from
isoniazid treatment on liver
Congestion of the central vein with
overall change in hepatic tissue
morphology (Figure 6).
Tissue changes resulting from
rifampicin and isoniazid treatment
on liver
Severe congestion of the interlobular
septum with severe infiltration of
inflammatory cells (figure 7).
Moreover, severe congestion in the
central vein, hepatic coagulative
necrosis and congestion of hepatic
sinusoids and fatty degenerative are
also seen (figure 8), which lead to
alteration in liver tissue morphology
(figure 9). Infiltration of portal area
and hepatic portal vein are also seen
(figure 10).
A
B
C
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Figure 8: Congestion of the central vein,(A) coagulative necrosis of hepatic cells(B) and congestion of hepatic sinusoids
(C) and fatty degenerative (D) in the
rifampicin and isoniazide treatedrat(1000X)
Figure 7: Severe congestion in theinterlobular septums (A), and infiltration
of sever inflammatory cells (B) in therifampicin and isoniazide treated rat
(1000X)
Figure 10: Slight infiltration in theinflammatory cells, (A) congestion of the
portal vein (B) and infiltration of theportal area (C) in the rifampicin and
isoniazide treated rat (400X)
Figure 9: Overall change in livermorphology in the rifampicin and
isoniazide treated rat(400X)
Lung tissue structure without
treatment
The lung is a double organ, and is
located in the thoracic cavity. The lung
is enveloped externally by a membrane
called the visceral pleura, which
extend from the membrane of parietal
pleura filling the thoracic cavity. The
trachea branches into two primary
bronchi, which in turn branch to
smaller bronchi and end up in the
terminal bronchioles and alveoli.
(figure11).
A
B
A
B
C
D
A
B
C
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Figure 11: Overall composition of the normal lung tissue; alveolar duct (A),
alveolarsac (B) and pulmonary duct (C) and pulmonary alveoli are visible (D) (400X)
Changes in lung tissue caused by
rifampicin effect
Microscopic test clearly showed
emphysema and infiltration of
inflammatory cells between the alveoli
(Figures 12, 13), congestion around the
bronchioles and inside the alveoli
(Figure 14), and infiltration of
inflammatory cells inside and outside
of the pulmonary alveoli (Figure 15).
A
B
C
D
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Figure 13. Emphysema (A) and bleedingaround the bronchiole(B) in therifampicin treated rat (1000X)
Figure 12. Emphysema in the rifampicintreated rat (1000X)
Figure 15. Infiltration of inflammatorycells inside (A) and outside of the
pulmonaryalveoli(B) in the rifampicintreated rat (1000X)
Figure14. Bloody congestion around thebronchiole (A) and the pulmonaryalveoli(B) in the rifampicin treated rat (1000X)
Changes in lung tissue caused by
isoniazid effectInfiltraion of inflammatory cells
around the terminal bronchioles and
between alveoli, (Figure16) in addition
to emphysema occurred (Figure 17).
A
A
B
B
A
A
B
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Discussion
Drug-induced liver disease is a well-
known side effect of several drugs that
are used for the treatment of active
tuberculosis or latent tuberculosis
infection. The duration of treatment
with isoniazid is 9 months. This long
duration might increase the risk of
hepatotoxicityand infection with
isoniazid- resistant organisms,
therefore, a shorter 3 month regimen of
isoniazid plus rifampicin regimen has
been recommended by the British
Thoracic Society1.
The present study showed several
changes in the form of congestion,necrosis and degenerative changes,
compared to the control group. This is
in line withEna J findings in 2005,
who recorded 2.6% hepatoxicity when
administrating rifampicin and isoniazid
simultaneously, compared with 1.1%
hepatoxicity when administrating
rifampicin alone, and 1.6% when
administrating isoniazid alone to
patients with tuberculosis15
. These
findings are not clearly explained,
however,several proposed mechanisms
have been suggested which include
dose-related toxicity, oxidative stress,
lipid peroxidation, immune-related,
induction of liver enzyme in the
hydrolase system, thus enhancing the
toxicity of some of the isoniazid toxic
metabolites, activation of CYP2E1,
and reduced glutathione level16,17
.
Hepatoxicity caused by
rifampicin could also explained by
hyperbilirubinemia, which overlaps
with the secretion of bilirubin,
consequently causing chloestasis,
increased fat oxides and difference in
liver transaminase enzymes15
.
Administrating rifampicin for long
periods of time may lead to death as a
result of waxing and liver cirrhosis18
.
In the course of the current study,
it was impossible to draw conclusion
as what drug has the most impact on
the liver. As such, the idea of
rifampicin increases the risk of liver
damage when administered with
isoniazid15
, but in light of the results
drawn from the present study,
administrating rifampicin alone caused
more damage on the liver than
administrating isoniazid alone, which
suggests the risk of using rifampicin on
the long-term.
The study also showed the
occurrence of various side effects on
lung tissue in all three groups (groups
2,3 and 4), which include lung
swelling caused by free roots affecting
lung tissue, consequently leading to
rupture of pulmonary alveoli, and
consequently, emphysema, in addition
to infiltration of inflammatory cellsinside and outside of the pulmonary
alveoli and inflammation of pulmonary
bronchioles but with varying degrees,
as the isoniazid and rifampicin treated
group showed more alterations than in
the group treated with the two drugs
separately19
.
In conclusion,rifampicin given alone
has shown a greater effect on the liver
than isoniazid given alone suggesting agreater role of rifampicin in the drug
induced hepatotoxicity. However,
combined drug administration
(rifampicin and isoniazid) revealed
more intense effects.
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